Dedicated groups (like the ones on ConsoleHacking and PSX-Place) have ported custom scripts, perk reworks, and even fan-made maps into PKG format. Want to play “Leviathan” (an underwater Zombies map) on your PS4? There’s a PKG for that. Want infinite GobbleGums or a rebalanced Ray Gun Mark 3? Someone’s packaged it.
The screen went black for three seconds, then displayed a terminal-style boot log: call of duty black ops 3 ps4 pkg